Exhaust and suction nozzle



1942- F. H. CARROLL EXHAUST AND SUCTION NOZZLE Filed S ept. 15, 1941 LIHHI w ll I A v m 5 9 s m m '1 f 9 1 4 1 1 3 a m INVENTOR.

H ['HRRHLL Patented Nov. 10, 1942 UNITED STAT ES Nil O F- FlCE 2,301,614; EXHAUSTAND SUCTION-NOZZLE FredH. Carroll, Jacksonville, Fla.

Application: September 15, 1941, Serial No. 410,908

(c1. 23o+10oy 4 Claims.

This invention relates toimprovements in exhaust and suction nozzles for locomotive engines, stationary. engines andinternal combustion engines.

It is the primary object ofthis invention to provide an, improved, simple and highly efiicient exhaust and. suction nozzle which is' of simple and sturdy construction, can readily and easily be assembled and effects substantialreduction of back-pressurein an engine.

Another object of the invention is the provision of an exhaust and suction nozzle of the type referred to above which embodies an axial exhaust passage, and a plurality of suction passages arranged in the circumferential wall of the nozzle for direct communication of said suction passages with the exhaust passage, and provided with inclined sidewalls to effect axially offset intersection of the exhaust stream with the suction streams and encircling of the exhaust stream by the suction streams when drawn into the exhaust passage.

Still another object of the invention is the provision of an exhaust and suction nozzle of the type referred to above which embodies an axial exhaust passage and a plurality of elongated, upwardly inclined suction passages arranged in the circumferential wall of the nozzle and provided with inclined side walls to effect axially offset intersection of the exhaust stream with the suction streams and encircling of the exhaust stream by the suction streams for rotation of the suction streams in screw lines around the exhaust stream when drawn into the exhaust passage by the exhaust stream and discharged therefrom together with the exhaust stream.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims; and a preferred form of embodiment of the invention is hereinafter shown with reference to the drawing accompanying and forming part of this specification.

In the drawing:

Fig. l is a side-view of an exhaust and suction nozzle according to the invention.

Fig. 2 is a vertical sectional view through the exhaust and suction nozzle shown in Fig. 1, the section being taken on line 2-2 ,of Fig. 3; and

Fig. 3 is a cross-sectional view through the exhaust and suction nozzle, the section being taken on line 3-3 of Fig. 1.

Referring now in detail to the exemplified form of the invention shown in the drawing,

reference numeral 2 denotes my improved exhaust andsuction nozzle which embodies a passaged. cone-shaped body 3, and a ring-shaped top member 4 seated upon body 3 and secured thereto by means of bolts 5. Body 3, at its upper. portion 6, is provided with a plurality of downwardly extended, symmetrically arranged posts Twhich are integrally formed with body 3, have elongated cross section and are. provided with threaded bores 8 for. bolts 5. The posts l support and mount ring-shaped top member 4 which is larger in diameter. than body 3 and has downwardly extended'therefrom a plurality of posts. 9': with bores lflsforbolts 5. Posts I and 9- maize. the. same cross section, are equal in number and-arrangedin alignment with each other topermittheb'olts 5 vbeingreadily extended through bores Hlfin top member 4 and threaded into bores 8 for attachment of top member 4 to body member 3.

Posts i and 9, the cross sections of which are elongated, are arranged so that the suction streams drawn through passages ll, formed by these posts and body and top members 3 and i, non-axially intersect the exhaust stream discharged through central passage l?. in body 3 (see Fig. 3) and advance in rotary movements around the exhaust stream. The discharged exhaust stream embodies a central exhaust stream and a plurality of suction streams travelling in screw lines around the central exhaust stream, an arrangement which reduces formation of turbulent streams in the exhaust and suction nozzle and accelerates expansion of the discharged exhaust stream, thus efiecting highest efiiciency in the discharge of the exhaust stream into and through a smoke stack.

The top member l, as shown, is provided with inclined wall portions H3 arranged at its bottom face between the downwardly extended posts and, body member 3 has its outer wall portions l5 at the top of said body inwardly inclined, so that suction passages II are upwardly inclined and converge toward each other somewhat above the outlet of said nozzle.

The thus described exhaust nozzle, when attached to the exhaust of a locomotive engine, guides exhaust steam through its cone-shaped exhaust passage l2, effects acceleration of such steam in said passage, due to the decrease in cross section of passage [2, and, finally, effects discharge of such steam through the outlet I6 in top member 4. The steam passing through the nozzle effects a substantial suction at the outlets of suction passages H and draws smoke and combustion gas from the smoke box of the locomotive engine, it being understood, that the exhaust nozzle is mounted, as customary, in the smoke box of the locomotive engine. The suction in passages ll of the nozzle is due to the increase in velocity of the exhaust steam near outlets I! of the suction passages H and due to the inclination of the passages II which acts to increase the relative pressure at the inlets of passages ll. Smoke and combustion gas streams entering from passages I I into passage l2 intersect the vapor stream flowing through passage l2 in axially offset relation, and therefore travel around such vapor stream in screw-lined streams of smoke and combustion gas (see arrows ll8 in Fig. 3). Such a rotary movement of-the smoke and combustion streams around the vapor stream accelerates expansion of the discharged exhaust stream and effects complete and proper filling of the smoke stack of the engine by the exhaust stream.

Having thus described my invention, What I claim is:

1. An exhaust and suction nozzle comprising a body member having an axial passage, a ringshaped top member secured to said body member in spaced relation with respect thereto, and a plurality of spacer means extended downwardly from said top member and forming passages between said top and body members, the axes of the latter passages being inclined both circumferentially and longitudinally with respect to the axis of said axial passage to effect encircling of an exhaust stream discharged from said axial passage by streams discharged from said passages between said top and body members.

2. In an exhaust and suction nozzle a central passage, and a plurality of passages encircling said central passage and in direct communica-- tion therewith, the axes of said plurality of passages being inclined both circumferentially and longitudinally with respect to the axis of said central passage to efiect encircling of an exhaust stream discharged from said central passage by streams discharged from said plurality of passages, said latter streams rotating around said exhaust stream.

3. In an exhaust and suction nozzle a central main passage, and a plurality oi upwardly inclined auxiliary passages arranged circumferentially around said central passage and in direct communication therewith, the axis of said auxiliary passages being inclined both circumferentially and longitudinally with respect to the axis of said central main passage to efiect rotary encircling of an exhaust stream discharged from said central main passage by secondary streams discharged from said auxiliary passages,

4. An exhaust and suction nozzle comprising a body member having an axial passage, a plurality of ribs with elongated cross sections integrally formed on the outside wall of said body member, a ring-shaped top member with downwardly extended spacer means having cross sections similar to those of said ribs, said spacer members being upon the ribs of said body member, and means rigidly connecting said top member in adjusted position to said body member, said ribs and spacer means being arranged so that the longer axis of the cross sections of adjoining ribs and spacer means intersect each other in points axially offset with respect to the axis of said axial passage toefiect encircling of a stream discharged from said axial passage by streams rotating around such first stream.

FRED H. CARROLL. 

